1
|
Cao X, Li S, Liu C. Effect of lysozyme combined with hydrothermal pretreatment on excess sludge and anaerobic digestion. J Environ Sci (China) 2025; 147:36-49. [PMID: 39003054 DOI: 10.1016/j.jes.2023.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 10/03/2023] [Accepted: 10/04/2023] [Indexed: 07/15/2024]
Abstract
Anaerobic digestion (AD) is widely employed for sludge stabilization and waste reduction. However, the slow hydrolysis process hinders methane production and leads to prolonged sludge issues. In this study, an efficient and eco-friendly lysozyme pre-treatment method was utilized to address these challenges. By optimizing lysozyme dosage, hydrolysis and cell lysis were maximized. Furthermore, lysozyme combined with hydrothermal pretreatment enhanced overall efficiency. Results indicate that: (1) When lysozyme dosage reached 90 mg/g TS after 240 min of pretreatment, SCOD, soluble polysaccharides, and protein content reached their maxima at 855.00, 44.09, and 204.86 mg/L, respectively. This represented an increase of 85.87%, 365.58%, and 259.21% compared to the untreated sludge. Three-dimensional fluorescence spectroscopy revealed the highest fluorescence intensity in the IV region (soluble microbial product), promoting microbial metabolic activity. (2) Lysozyme combined with hydrothermal pretreatment significantly increased SCOD, soluble proteins, and polysaccharide release from sludge, reducing SCOD release time. Orthogonal experiments identified Group 3 as the most effective for SCOD and soluble polysaccharide release, while Group 9 released the most soluble proteins. The significance order of factors influencing SCOD, soluble proteins, and polysaccharide release is hydrothermal temperature > hydrothermal time > enzymatic digestion time.(3) The lysozyme-assisted hydrothermal pretreatment group exhibited the fastest release and the highest SCOD concentration of 8,135.00 mg/L during anaerobic digestion. Maximum SCOD consumption and cumulative gas production increased by 95.89% and 130.58%, respectively, compared to the control group, allowing gas production to conclude 3 days earlier.
Collapse
Affiliation(s)
- Xiuqin Cao
- School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Key Laboratory of Urban Storm water System and Water Environment (Ministry of Education), Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
| | - Songyue Li
- School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Chaolei Liu
- School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| |
Collapse
|
2
|
Lu Z, Liu G, Xie H, Zhai Y, Li X. Advances and solutions in biological treatment for antibiotic wastewater with resistance genes: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 368:122115. [PMID: 39121628 DOI: 10.1016/j.jenvman.2024.122115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 07/16/2024] [Accepted: 08/03/2024] [Indexed: 08/12/2024]
Abstract
Biological treatment represents a fundamental component of wastewater treatment plants (WWTPs). The transmission of antibiotic resistance bacteria (ARB) and resistance genes (ARGs) occurred through the continuous migration and transformation, attributed to the residual presence of antibiotics in WWTPs effluent, posing a significant threat to the entire ecosystem. It is necessary to propose novel biological strategies to address the challenge of refractory contaminants, such as antibiotics, ARGs and ARB. This review summarizes the occurrence of antibiotics in wastewater, categorized by high and low concentrations. Additionally, current biological treatments used in WWTPs, such as aerobic activated sludge, anaerobic digestion, sequencing batch reactor (SBR), constructed wetland, membrane-related bioreactors and biological aerated filter (BAF) are introduced. In particular, because microorganisms are the key to those biological treatments, the effect of high and low concentration of antibiotics on microorganisms are thoroughly discussed. Finally, solutions involving functional bacteria, partial nitrification (PN)-Anammox and lysozyme embedding are suggested from the perspective of the entire biological treatment process. Overall, this review provides valuable insights for the simultaneous removal of antibiotics and ARGs in antibiotics wastewater.
Collapse
Affiliation(s)
- Ziyi Lu
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Gaige Liu
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Hongwei Xie
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Yining Zhai
- School of Civil Engineering, Heilongjiang University, Harbin 150080, China
| | - Xiangkun Li
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China.
| |
Collapse
|
3
|
Wu J, Xiong L, Huang X, Li C, Li F, Wong JWC. Silver sulfide nanoparticles eliminate the stimulative effects of earthworms on nutrient uptake by soybeans in high organic matter soils. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 947:174433. [PMID: 38960153 DOI: 10.1016/j.scitotenv.2024.174433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 06/03/2024] [Accepted: 06/30/2024] [Indexed: 07/05/2024]
Abstract
A significant knowledge gap exists regarding the impact of soil organic matter on the bioavailability of Ag2S-NPs (environmentally relevant forms of Ag-NPs) in soil-earthworm-plant systems. This study used two soils with varying organic matter content, both with and without earthworms, to investigate the bioavailability of Ag2S-NPs. The findings revealed an 80 % increase in Ag bioaccessibility to soybeans in soils with high organic matter content compared to soils with low organic matter. Additionally, the presence of earthworms significantly increased Cl concentrations from 24.3-62.2 mg L-1 to 80.1-147.2 mg L-1, triggering the elevated bioavailability of Ag. Interestingly, Ag2S-NPs eliminated the stimulative effects of earthworms on plant nutrient uptake. In the presence of earthworms, the high organic matter soil amended with Ag2S-NPs exhibited lower concentrations of essential elements (Ca, Cu, Fe, K, and P) in plant tissues compared to soils without earthworms. Our study presents evidence of the transformation of Ag2S-NPs into Ag-NPs across various soil solutions, resulting in the formation of Ag nanoparticle complexes. Particularly noteworthy is the significant reduction in particle sizes in soils incubated with earthworms and high organic matter content, from 85.0 nm to 40.2 nm. Notably, in the rhizosphere soil, a decrease in the relative abundance of nutrient cycling-related phyla was observed, with reductions of 18.5 % for Proteobacteria and 30.0 % for Actinobacteriota. These findings offer valuable insights into the biological and biochemical consequences of Ag2S-NP exposure on earthworm-mediated plant nutrient acquisition.
Collapse
Affiliation(s)
- Jingtao Wu
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, PR China; Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; The University of Queensland, School of Agriculture and Food Sciences, St Lucia, Queensland 4072, Australia
| | - Lei Xiong
- The University of Queensland, School of Agriculture and Food Sciences, St Lucia, Queensland 4072, Australia; Smart Water Affairs Research Center, Shenzhen University, Shenzhen 518000, China
| | - Xingyun Huang
- Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Cui Li
- The University of Queensland, School of Agriculture and Food Sciences, St Lucia, Queensland 4072, Australia; Northwestern Polytechnical University, Research Centre for Ecology and Environmental Sciences, Xi'an 710072, China
| | - Feng Li
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, PR China; College of Chemistry & Biology and Environmental Engineering, Xiangnan University, Chenzhou 423043, Hunan, PR China; Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
| | - Jonathan W C Wong
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, PR China
| |
Collapse
|
4
|
Yan H, Xu L, Su J, Wei H, Li X. Synergistic promotion of sludge reduction by surfactant-producing and lysozyme-producing bacteria: Optimization and effect of Na . BIORESOURCE TECHNOLOGY 2024; 393:130065. [PMID: 37984671 DOI: 10.1016/j.biortech.2023.130065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 11/22/2023]
Abstract
To improve the efficiency of aerobic digestion, this investigation utilized the synergistic effect of lysozyme-producing strain YH14 and surfactant-producing strain ZXY4 to promote sludge hydrolysis, and added NaCl to enhance this promoting effect. The best performance in promoting sludge hydrolysis was achieved when the inoculum of functional bacteria was 12 % (inoculum ratio of strain YH14: strain ZXY4 = 1:3) and the dosage of NaCl was 5 g L-1, which caused an increase of 19.25 % in the SS removal rate and 2588.21 mg L-1 in the SCOD release, as compared with the control. Fluorescence region integral analysis shows that the synergy of two functional bacteria and NaCl can enhance the biodegradability of sludge. Protein secondary structure analysis shows that strain ZXY4 and Na+ cause the EPS structure to loosen, increasing the chances of lysozyme lysis of bacteria. Nucleotide metabolism, metabolism of other amino acids and membrane transport enhanced in a co-processing system.
Collapse
Affiliation(s)
- Huan Yan
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Liang Xu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Junfeng Su
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
| | - Hao Wei
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Xuan Li
- College of Environmental Science & Engineering, Yancheng Institute of Technology, Yancheng 224051, China
| |
Collapse
|
5
|
Chi B, Huang Y, Xiong Z, Tan J, Zhou W, Yang Z, Zhou K, Duan X, Chen A, Zha R, Gui K. Investigation of lysing excess sludge slurry using hydrolase secreting thermophilic bacterial communities. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 349:119562. [PMID: 37952379 DOI: 10.1016/j.jenvman.2023.119562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 10/22/2023] [Accepted: 11/04/2023] [Indexed: 11/14/2023]
Abstract
Sludge reduction is a critical challenge in biological wastewater treatment. Combining excess sludge slurry lysis technology with traditional activated sludge processes is a promising approach for in-situ sludge reduction. Here, a strategy for excess sludge slurry lysis based on thermophilic bacterial communities (LTBC) was proposed. This investigation focused on the process of excess sludge slurry lysis dominated by thermophilic bacterial communities domesticated at different temperatures (55-75 °C). The evolution of sludge lysate was analyzed, and the mechanism of excess sludge slurry lysis under the action of thermophilic bacterial communities was elucidated through amplicon sequencing analysis. The results demonstrated that the aerobic thermophilic bacterial communities adapted to 75 °C exhibit the highest efficiency in sludge slurry lysis. During LTBC process, the removal efficiency of volatile suspended solids reached 53.9 ± 1.8% within 2 h, and 97.0 ± 1.0% of the protein and 96.0 ± 1.0% of the polysaccharide in the extracellular polymers was solubilized, and bacterial cell walls in sludge were disrupted. Fourier transform infrared spectroscopy and excitation-emission matrix spectroscopy of the sludge lysate demonstrated that the LTBC process was accompanied by humification process. The accumulation of humic acid primarily occurred at 55 °C and 65 °C, while fulvic acid occurred at 75 °C. The thermophilic bacterial communities adapted to 75 °C were dominated by Thermus and Thermaerobacter. Phylogenetic studies showed that the LTBC hydrolase system comprises enzymes related to protein hydrolysis, carbohydrate hydrolysis, and peptidoglycan hydrolysis, including metalopeptidase MepB, neutral α-glucosidase C, N-acetyl Muramyl-L-alanine amidase, and others enzymes. These results provide a theoretical basis for the application of LTBC technology in the reduction of sludge which generated in traditional waste water activated sludge processes.
Collapse
Affiliation(s)
- Baoyan Chi
- Solid Waste Treatment and Resource Recycle Research Laboratory, Department of Environmental Science and Technology, School of Energy and Environment, Southeast University, Nanjing, 210096, PR China; Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing, 210096, PR China
| | - Ying Huang
- Solid Waste Treatment and Resource Recycle Research Laboratory, Department of Environmental Science and Technology, School of Energy and Environment, Southeast University, Nanjing, 210096, PR China; Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing, 210096, PR China.
| | - Zhenfeng Xiong
- Solid Waste Treatment and Resource Recycle Research Laboratory, Department of Environmental Science and Technology, School of Energy and Environment, Southeast University, Nanjing, 210096, PR China; Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing, 210096, PR China
| | - Jiali Tan
- Solid Waste Treatment and Resource Recycle Research Laboratory, Department of Environmental Science and Technology, School of Energy and Environment, Southeast University, Nanjing, 210096, PR China; Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing, 210096, PR China
| | - Weidong Zhou
- Nanjing Water Group Co., Ltd., Nanjing, 210002, PR China
| | - Zhuo Yang
- Central & South China Municipal Engineering Design and Research Institute Co., Ltd., Wuhan, 430010, PR China
| | - Kemei Zhou
- Nanjing Water Group Co., Ltd., Nanjing, 210002, PR China
| | - Xinxin Duan
- Solid Waste Treatment and Resource Recycle Research Laboratory, Department of Environmental Science and Technology, School of Energy and Environment, Southeast University, Nanjing, 210096, PR China
| | - Ao Chen
- Solid Waste Treatment and Resource Recycle Research Laboratory, Department of Environmental Science and Technology, School of Energy and Environment, Southeast University, Nanjing, 210096, PR China
| | - Rong Zha
- Zhenjiang Esther Environment Protection Technology Co., Ltd., Jurong City, 212400, PR China
| | - Keting Gui
- Solid Waste Treatment and Resource Recycle Research Laboratory, Department of Environmental Science and Technology, School of Energy and Environment, Southeast University, Nanjing, 210096, PR China
| |
Collapse
|
6
|
Karyani TZ, Ghattavi S, Homaei A. Application of enzymes for targeted removal of biofilm and fouling from fouling-release surfaces in marine environments: A review. Int J Biol Macromol 2023; 253:127269. [PMID: 37804893 DOI: 10.1016/j.ijbiomac.2023.127269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 09/07/2023] [Accepted: 10/04/2023] [Indexed: 10/09/2023]
Abstract
Biofouling causes adverse issues in underwater structures including ship hulls, aquaculture cages, fishnets, petroleum pipelines, sensors, and other equipment. Marine constructions and vessels frequently are using coatings with antifouling properties. During the previous ten years, several alternative strategies have been used to combat the biofilm and biofouling that have developed on different abiotic or biotic surfaces. Enzymes have frequently been suggested as a cost-effective, substitute, eco-friendly, for conventional antifouling and antibiofilm substances. The destruction of sticky biopolymers, biofilm matrix disorder, bacterial signal interference, and the creation of biocide or inhibitors are among the catalytic reactions of enzymes that really can successfully prevent the formation of biofilms. In this review we presented enzymes that have antifouling and antibiofilm properties in the marine environment like α-amylase, protease, lysozymes, glycoside hydrolase, aminopeptidases, oxidase, haloperoxidase and lipases. We also overviewed the function, benefits and challenges of enzymes in removing biofouling. The reports suggest enzymes are good candidates for marine environment. According to the findings of a review of studies in this field, none of the enzymes were able to inhibit the development of biofilm by a site marine microbial community when used alone and we suggest using other enzymes or a mixture of enzymes for antifouling and antibiofilm purposes in the sea environment.
Collapse
Affiliation(s)
- Tayebeh Zarei Karyani
- Department of Marine Biology, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran
| | - Saba Ghattavi
- Fisheries Department, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran
| | - Ahmad Homaei
- Department of Marine Biology, Faculty of Marine Science and Technology, University of Hormozgan, Bandar Abbas, Iran.
| |
Collapse
|
7
|
Liu S, Wu J, Hu Z, Jiang M. Changes in microbial community during hydrolyzed sludge reduction. Front Microbiol 2023; 14:1239218. [PMID: 37720154 PMCID: PMC10502510 DOI: 10.3389/fmicb.2023.1239218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 08/21/2023] [Indexed: 09/19/2023] Open
Abstract
In this study, the effects of different enzymes (lysozyme, α-amylase and neutral protease) on sludge hydrolysis efficiency and microbial community in sequencing batch reactor (SBR) were introduced. The results showed that the hydrolysis efficiencies of the three enzymes were 48.5, 22.5 and 31%, respectively, compared with the accumulated sludge discharge of the blank control group. However, it has varying degrees of impact on the effluent quality, and the denitrification and phosphorus removal effect of the system deteriorates. The lysozyme that achieves the optimal sludge hydrolysis effect of 48.5% has the greatest impact on the chemical oxygen demand (COD), total nitrogen (TN), and nitrate nitrogen (NO3--N) of the effluent. The sludge samples of the control group and the groups supplemented with different enzyme preparations were subjected to high-throughput sequencing. It was found that the number of OTUs (Operational Taxonomic Units) of the samples was lysozyme > α-amylase > blank control > neutral protease. Moreover, the abundance grade curve of the sludge samples supplemented with lysozyme and α-amylase was smoother, and the community richness and diversity were improved by lysozyme and α-amylase. The species diversity of the sludge supplemented with lysozyme and neutral protease was great, and the community succession was obvious. The introduction of enzymes did not change the main microbial communities of the sludge, which were mainly Proteobacteria, Actinobacteria and Bacteroidetes. The effects of three enzyme preparations on sludge reduction and microbial diversity during pilot operation were analyzed, the gap in microbial research was filled, which provided theoretical value for the practical operation of enzymatic sludge reduction.
Collapse
Affiliation(s)
- Shaomin Liu
- School of Earth and Environment, Anhui University of Science and Technology, Huainan, China
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines (Anhui University of Science and Technology), Huainan, China
| | - Jiating Wu
- School of Earth and Environment, Anhui University of Science and Technology, Huainan, China
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines (Anhui University of Science and Technology), Huainan, China
| | - Ziyan Hu
- School of Earth and Environment, Anhui University of Science and Technology, Huainan, China
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines (Anhui University of Science and Technology), Huainan, China
| | - Mengyu Jiang
- School of Earth and Environment, Anhui University of Science and Technology, Huainan, China
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines (Anhui University of Science and Technology), Huainan, China
| |
Collapse
|
8
|
Chen Z, Zhu S, Gao S, Sun C, Tian Z, Wen X. A hyperthermophilic anaerobic fermentation platform for highly efficient short chain fatty acids production from thermal hydrolyzed sludge. WATER RESEARCH 2023; 243:120434. [PMID: 37573843 DOI: 10.1016/j.watres.2023.120434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 07/27/2023] [Accepted: 07/28/2023] [Indexed: 08/15/2023]
Abstract
In this study, a carboxylate platform of hyperthermophilic (70 ℃) anaerobic fermentation (HAF) for short chain fatty acids (SCFAs) production from thermal hydrolyzed sludge (THS) was established. The long-term performance for SCFAs production and the microbial communities of this HAF under different SRTs were systematically investigated. Under the optimum SRT of 3 d, the HAF had the highest acetate production rate of 1.12 g COD/L/d which accounted for 60% in SCFAs. It also rendered a good performance in SCFAs production, with concentration, production rate and yield of 6.61 g COD/L, 1.86 g COD/L/d and 324 g COD/kg VSSin, respectively. Nearly no biogas produced from this system, which reduced the loss of carbon sources from the system. This was due to the inhibition of methanogenesis by the hyperthermophilic condition and the high content of total ammonia nitrogen (TAN) and free ammonia nitrogen (FAN). Tepidimicrobium, Bhargavaea and XBB1006 were the dominant genus-level biomarkers under the optimum SRT, which facilitated the decomposition of monosaccharides, amino acids, terpenoids and polyketides into SCFAs. This work provides an applicable anaerobic carboxylate platform for highly efficient SCFAs production from excess sludge.
Collapse
Affiliation(s)
- Zhan Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Shihui Zhu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Shan Gao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Chenxiang Sun
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Zeshen Tian
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Xianghua Wen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
| |
Collapse
|
9
|
Pan X, Zou X, He J, Pang H, Zhang P, Zhong Y, Ding J. Enhancing short-chain fatty acids recovery through anaerobic fermentation of waste activated sludge with cation exchange resin assisted lysozyme pretreatment: Performance and mechanism. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
|
10
|
Yan H, Ali A, Su J, Shi J, Xu L, Huang T, Wang Y. Sodium alginate/sinter gel spheres immobilized lysozyme producing strain SJ25 enhanced sludge reduction: Optimization and mechanism. BIORESOURCE TECHNOLOGY 2023; 371:128643. [PMID: 36681345 DOI: 10.1016/j.biortech.2023.128643] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/10/2023] [Accepted: 01/15/2023] [Indexed: 06/17/2023]
Abstract
In order to promote sludge hydrolysis and improve the efficiency of aerobic digestion, the sodium alginate immobilized gel spheres pellet B (SIP B) were prepared using sodium alginate (SA) and sinter as carrier to immobilize lysozyme producing strain SJ25. The optimal conditions for SIP B to promote sludge hydrolysis were 5.6 mg SS-1 dosage and pH of 9.0. Under the optimal condition compared with the control group, the reduction efficiency of suspended solids (SS) in 24 h was increased by 26.89 %, the release of soluble chemical oxygen demand (SCOD) was increased by 517.79 mg L-1, polysaccharide (PS) and protein (PN) concentrations were increased by 186.69 and 368.68 mg L-1, respectively. SIP B enhanced the degradation efficiency of sludge by promote the release of lysozyme, prolonging the action time of the enzyme, enhancing the metabolism and membrane transport of xenobiotics, carbohydrate and amino.
Collapse
Affiliation(s)
- Huan Yan
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Amjad Ali
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Junfeng Su
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
| | - Jun Shi
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Liang Xu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Tinglin Huang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Yuxuan Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| |
Collapse
|
11
|
Allam NE, Zakaria BS, Kuznetsov PV, Dhar BR, Ulrich AC. Mitigating methane emission from oil sands tailings using enzymatic and lime treatments. CHEMOSPHERE 2023; 313:137455. [PMID: 36470354 DOI: 10.1016/j.chemosphere.2022.137455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 11/30/2022] [Accepted: 12/01/2022] [Indexed: 06/17/2023]
Abstract
Engineering strategies to reduce greenhouse gases (GHGs) emissions by inhibiting methanogenesis in oil sands tailings have rarely been examined. In this study, we explored the potential impact of chemical treatment (lime) and biological treatment using enzymes (lysozyme and protease) on inhibiting methane emissions from tailings. Overall, treatment with protease 3%, lysozyme 3%, and lime 5000 ppm reduced CH4 production (by 52%, 28%, and 25%, respectively) and were weakly associated with the archaeal abundance. Enzymes treatment resulted in a higher reduction in CH4 production compared with lime treatment. A 3% lysozyme treatment suppressed CH4 production (the change in methane was 0.48 mmol) and reduced the degradation of hexane throughout the experiment. Similarly, 3% protease suppressed CH4 production throughout the experiment (the change in methane was 0.78 mmol), which could be attributed to the pH reduction to pH 4.9 at week 23 resulting from the formation of volatile fatty acids. Another possible mechanism could be the formation of toxic compounds, such as high nitrogen content, after protease treatment that inhibited the microbial community. The toxicity effect to Vibrio fischeri was greater with lysozyme 3% and protease 3% treatment than with lime treatment (124 TU and 76 TU, respectively). Lime treatment resulted in the highest reduction in 16S rRNA gene copies from 5.7 × 106 cells g-1 (control) to 2.7 × 105, 1.71 × 105, and 1.4 × 105 cells g-1 for 1600, 3500, and 5000 ppm treatments, respectively. This study supports further work to examine and determine the optimum conditions (e.g., enzyme and lime dosages) for CH4 inhibition.
Collapse
Affiliation(s)
- Nesma Eltoukhy Allam
- Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Basem S Zakaria
- Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Petr V Kuznetsov
- Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Bipro Ranjan Dhar
- Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Ania C Ulrich
- Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
| |
Collapse
|
12
|
Wang W, Wang K, Zhao Q, Yang L. Maximizing electron flux, microbial diversity and gene abundance in MFC powered electro-Fenton system by optimizing co-addition of lysozyme and 2-bromoethanesulfonate. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 322:116067. [PMID: 36049306 DOI: 10.1016/j.jenvman.2022.116067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 08/09/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
In this study, a microbial fuel cell powered electro-Fenton system (MFCⓅEFs) was established in order to overcome the shortcomings of low electron flux and unexpected methane production, while simultaneously treating excess sludge (ES, substrate) and refractory syringic acid (SA). A strategy of co-adding lysozyme (LZ, as ES degradation catalyst) and 2-bromoethanesulfonate (BES, as methane inhibitor) into ES was optimized in MFCⓅEFs to maximize electron flux, microbial community diversity and functional gene abundance. The removal of sludge total chemical oxygen demand (TCOD) achieved 81.69% in 25 d under an optimal co-addition strategy (40.41 mg/gSS of LZ, 27.03 mmol/L of BES, adding on 22.8 h of the7th day), with a simultaneous high degradation of SA (99.30% in 25 h). Correspondingly, a maximum power density of 3.35 W/m3 was achieved (only 0.62 W/m3 from the control), which effectively realizes in-situ micro-electricity generation and utilization for bioelectric Fenton processes. Moreover, 42.25% of the total charges were employed for bio-electricity generation. The electricigens of Pseudomonas, Acinetobacter and Chlorobium showed effective enrichment, while the abundance of methanogenesis archaea was extremely decreased. Functional genes associated with methanogenesis including mtaA, hdra, and mcrA were effectively inhibited. The life cycle assessment along with an optimized co-addition strategy illustrated a beneficial environmental effect, particularly in terms of ecosystem quality and climate change. Above all, an enhanced synchronous degradation of excess sludge and refractory pollutants had been realized in a green and environmentally friendly way.
Collapse
Affiliation(s)
- Weiye Wang
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
| | - Kun Wang
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
| | - Qingliang Zhao
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
| | - Lin Yang
- School of Chemical Engineering and Chemistry, Harbin Institute of Technology, Harbin, 150090, China.
| |
Collapse
|
13
|
Zhao L, Zhang J, Xu Z, Cai S, Chen L, Cai T, Ji XM. Bioconversion of waste activated sludge hydrolysate into polyhydroxyalkanoates using Paracoccus sp. TOH: Volatile fatty acids generation and fermentation strategy. BIORESOURCE TECHNOLOGY 2022; 363:127939. [PMID: 36100183 DOI: 10.1016/j.biortech.2022.127939] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 06/15/2023]
Abstract
The expensive carbon matrix is a bottleneck restricting the industrialization of polyhydroxyalkanoates (PHAs). Volatile fatty acids (VFAs) derived from waste activated sludge via anaerobic fermentation might be alternative carbon matters for PHAs synthesis. In this study, the effect of enzymes on VFAs yields and the feasibility of the produced VFAs for PHAs fermentation by Paracoccus sp. TOH were investigated. The optimum cumulative VFAs concentration reached 4076.6 mg-COD·L-1 in the lysozyme treatment system. Correspondingly, the highest poly(3-hydroxybuturate-co-3-hydroxyvalerate) (PHBV) concentration (119.1 mg·L-1) containing 20.3 mol% 3-hydroxyvalerate was obtained. It proved that Paracoccus sp. TOH possesses the capability for PHBV accumulation. The functional hydrolytic-acidogenic microorganisms, such as Clostridium sensu stricto and Bacteroides sp. were accumulated. The functional genes encoding hydrolysis, carbohydrates metabolism, VFAs generation were enriched. This study offered a possible strategy for VFAs production and verified the feasibility of sludge hydrolysate as a high-quality carbon substrate for PHAs fermentation.
Collapse
Affiliation(s)
- Leizhen Zhao
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Jiaqi Zhang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Ziyu Xu
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Shu Cai
- Department of Biological and Agricultural Engineering, University of California, Davis, CA 95616, United States
| | - Liwei Chen
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Tianming Cai
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Xiao-Ming Ji
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
| |
Collapse
|
14
|
He J, Zhang P, Zou X, Zhong Y, Pan X, Pang H, Zhang J, Cui X, Wu X, Li B, Tang X, Xiao X. Impact of divalent cations on lysozyme-induced solubilisation of waste-activated sludge: Perspectives of extracellular polymeric substances and surface electronegativity. CHEMOSPHERE 2022; 302:134841. [PMID: 35525448 DOI: 10.1016/j.chemosphere.2022.134841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 04/22/2022] [Accepted: 05/01/2022] [Indexed: 06/14/2023]
Abstract
Lysozyme hydrolysis can accelerate waste-activated sludge (WAS) solubilisation, which can significantly shorten the process and promote the efficiency of anaerobic digestion. This study investigated the impact of divalent cations on lysozyme-induced solubilisation of WAS. The performance of lysozyme pretreatment was dramatically inhibited by Mg2+ and Ca2+. Compared to the control group, the amount of net SCOD, protein, and polysaccharides released to the supernatant were reduced by 36.6%, 44.7%, and 35.8%, respectively, in the presence of divalent cations. The extracellular polymeric substance (EPS) matrix became tightly bound, resulting in fewer proteins and polysaccharides being extracted from loosely-bound EPS (LB-EPS) with divalent cations, which was detrimental to the solubilisation of WAS. Divalent cations decreased the surface electronegativity of sludge particles and prolonged the adsorption of lysozymes by sludge flocs. More than 16.6% of total lysozymes remained in the liquid phase of WAS after 240 min Mg2+ and Ca2+ strengthened the binding among proteins and polysaccharides and promoted the intermolecular cross-linking of polysaccharides. The EPS matrix formed a dense spatial reticular structure that blocked the transfer of lysozymes from the EPS matrix to the pellet. As a result, the lysozymes accumulated in LB-EPS rather than hydrolysing the microorganism's cell wall. This study provides a new perspective on the restriction of WAS pretreatment with lysozymes and optimises the method of lysozyme-induced solubilisation of WAS.
Collapse
Affiliation(s)
- Junguo He
- School of Civil Engineering, Guangzhou University, Guangzhou, 510006, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
| | - Pengfei Zhang
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Xiang Zou
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Yijie Zhong
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Xinlei Pan
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Heliang Pang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Jie Zhang
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Xinxin Cui
- School of Civil Engineering, Guangzhou University, Guangzhou, 510006, PR China
| | - Xuewei Wu
- Guangzhou Sewage Purification Co.,LTD, Guangzhou, 510655, PR China
| | - Biqing Li
- Guangzhou Sewage Purification Co.,LTD, Guangzhou, 510655, PR China
| | - Xia Tang
- Guangzhou Sewage Purification Co.,LTD, Guangzhou, 510655, PR China
| | - Xiannian Xiao
- Guangzhou Sewage Purification Co.,LTD, Guangzhou, 510655, PR China
| |
Collapse
|
15
|
Shi J, Su J, Ali A, Xu L, Yan H, Su L, Qi Z. Newly isolated lysozyme-producing strain Proteus mirabilis sp. SJ25 reduced the waste activated sludge: Performance and mechanism. BIORESOURCE TECHNOLOGY 2022; 358:127392. [PMID: 35640815 DOI: 10.1016/j.biortech.2022.127392] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 05/24/2022] [Accepted: 05/26/2022] [Indexed: 06/15/2023]
Abstract
To promote aerobic digestion of sludge, a lysozyme-producing strain was screened and identified as Proteus mirabilis sp. SJ25. The results of response surface methodology (RSM) showed that at the temperature of 30.8 °C, pH of 6.69, and the inoculum amount of 2.81%, the sludge reduced by 26.58%. Compared with the control group, the removal efficiency of suspended solids (SS) from sludge in the experimental group increased by 14.60%, the release of soluble chemical oxygen demand (SCOD) increased by 2.21 times, and the release of intracellular substances increased significantly. Actinobacteriota, Chloroflexi, Proteobacteria, Bacteroidota, and Firmicutes were the main phyla involved in the sludge reduction process. Strain SJ25 enhanced the degradation rate of sludge by releasing lysozyme lysis to lyse bacteria, enhancing the metabolism and membrane transport of carbohydrates and amino acids. This study provides a new perspective in the field of efficient degradation of waste sludge.
Collapse
Affiliation(s)
- Jun Shi
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Junfeng Su
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
| | - Amjad Ali
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Liang Xu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Huan Yan
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Lindong Su
- Xi'an Yiwei Putai Environmental Protection Co., Ltd., Xi'an 710055, China
| | - Zening Qi
- Xi'an Yiwei Putai Environmental Protection Co., Ltd., Xi'an 710055, China
| |
Collapse
|
16
|
Zhang P, He J, Zou X, Zhong Y, Pan X, Zhang J, Pang H. Impact of magnesium ions on lysozyme-triggered disintegration and solubilization of waste activated sludge. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 315:115148. [PMID: 35512601 DOI: 10.1016/j.jenvman.2022.115148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2021] [Revised: 04/07/2022] [Accepted: 04/21/2022] [Indexed: 06/14/2023]
Abstract
Lysozyme can efficiently accelerate solubilization and hydrolysis of waste activated sludge (WAS) for anerobic digestion. However, the effect of lysozyme was easily to be inhibited by metal ions in WAS. The impact of magnesium ions (Mg2+) on lysozyme catalyze WAS disintegration was investigated in this study. The effect of lysozyme on WAS hydrolysis could be hindered by Mg2+. Relatively high concentrations (>50 mg/L) of Mg2+ in sludge significantly reduced the release of soluble polysaccharides and proteins from WAS, while sulfate ions or chloride ions caused no such effect. Proteins were difficult to be extracted from extracellular polymeric substances (EPS) of WAS in the presence of Mg2+ (>10 mg/L) due to the divalent cation bridging (DCB) behavior, while the extraction of polysaccharides was not significantly affected. The polysaccharides and proteins in the inner EPS layer were transferred to the outer layer during the lysozyme treatment, and total quantities of both components maintained constantly. At least 23.1% lysozymes were trapped in the liquid phase of 100 mg Mg2+/L in the first hour. Mg2+ could significantly affect the transfer of lysozyme from liquid phase to the inner layer of sludge. Mg2+ neutralized the negative surface charge of the sludge particles, which hindered the absorption of positively charged lysozyme molecules by sludge flocs from the liquid phase. The proteins of TB-EPS had higher ratios of α-helixes and tighter structures than those in LB-EPS, which could impede the lysozyme transfer to the cell wall.
Collapse
Affiliation(s)
- Pengfei Zhang
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
| | - Junguo He
- School of Civil Engineering, Guangzhou University, Guangzhou, 510006, PR China
| | - Xiang Zou
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Yijie Zhong
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Xinlei Pan
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Jie Zhang
- School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Heliang Pang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| |
Collapse
|
17
|
Zou X, He J, Zhang P, Pan X, Zhong Y, Zhang J, Wu X, Li B, Tang X, Xiao X, Pang H. Insights into carbon recovery from excess sludge through enzyme-catalyzing hydrolysis strategy: Environmental benefits and carbon-emission reduction. BIORESOURCE TECHNOLOGY 2022; 351:127006. [PMID: 35304256 DOI: 10.1016/j.biortech.2022.127006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/10/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
This study introduced the excellent improvement of enzyme cocktail (lysozyme and protease) on hydrolysis efficiency and the role of reducing carbon emission as an alternative carbon source. The best dosing method after optimization was to add four parts of lysozyme at 0 h and one part of protease at 1 h. The extracellular proteins and polysaccharides increased by 118% and 64% respectively under the optimal dosing mode. Enzyme cocktails reduced more organic matters and extended the distribution of sludge particles in the small particle size part. The enzymatic-treated sludge could reduce 21.09 kg CO2/t VSS if utilized to replace methanol for denitrification carbon source. Enzyme cocktails did better in enhancing both solubilization and hydrolysis than single enzymes under the optimal method. This study will provide a more integrated and comprehensive system for enzymatic pretreatment and new insight into the enzymatic pretreatment enhancing hydrolysis and reducing carbon emission.
Collapse
Affiliation(s)
- Xiang Zou
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China.
| | - Junguo He
- School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong, People's Republic of China
| | - Pengfei Zhang
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China
| | - Xinlei Pan
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China
| | - Yijie Zhong
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China
| | - Jie Zhang
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China
| | - Xuewei Wu
- Guangzhou Sewage Purification Co.,LTD, Guangzhou 510655, Guangdong, People's Republic of China
| | - Biqing Li
- Guangzhou Sewage Purification Co.,LTD, Guangzhou 510655, Guangdong, People's Republic of China
| | - Xia Tang
- Guangzhou Sewage Purification Co.,LTD, Guangzhou 510655, Guangdong, People's Republic of China
| | - Xiannian Xiao
- Guangzhou Sewage Purification Co.,LTD, Guangzhou 510655, Guangdong, People's Republic of China
| | - Heliang Pang
- State key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, People's Republic of China; Shaanxi Key Laboratory of Environmental Engineering, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, People's Republic of China
| |
Collapse
|
18
|
Zainul Kamal S, Koyama M, Syukri F, Toda T, Tran QNM, Nakasaki K. Effect of enzymatic pre-treatment on thermophilic composting of shrimp pond sludge to improve ammonia recovery. ENVIRONMENTAL RESEARCH 2022; 204:112299. [PMID: 34743806 DOI: 10.1016/j.envres.2021.112299] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 10/24/2021] [Accepted: 10/25/2021] [Indexed: 06/13/2023]
Abstract
In recent years, attempts have been made to develop a thermophilic composting process for organic sludge to produce ammonia gas for high value-added algal production. However, the hydrolysis of non-dissolved organic nitrogen in sludge is a bottleneck for ammonia conversion. The aim of this study was to identify enzymes that enhance sludge hydrolysis in a thermophilic composting system for ammonia recovery from shrimp pond sludge. This was achieved by screening useful enzymes to degrade non-dissolved nitrogen and subsequently investigating their effectiveness in lab-scale composting systems. Among the four hydrolytic enzyme classes assessed (lysozyme, protease, phospholipase, and collagenase), proteases from Streptomyces griseus were the most effective at hydrolysing non-dissolved nitrogen in the sludge. After composting sludge pre-treated with proteases, the final amount of non-dissolved nitrogen was 46.2% of the total N in the control sample and 22.3% of the total N in the protease sample, thus increasing the ammonia (gaseous and in-compost) conversion efficiency from 41.5% to 56.4% of the total N. The decrease in non-dissolved nitrogen was greater in the protease sample than in the control sample during the pre-treatment period, and no difference was observed during the subsequent composting period. These results suggest that Streptomyces proteases hydrolyse the organic nitrogen fraction, which cannot be degraded by the bacterial community in the compost. Functional potential analysis of the bacterial community using PICRUSt2 suggested that 4 (EC:3.4.21.80, EC:3.4.21.81, EC:3.4.21.82, and EC:3.4.24.77) out of 13 endopeptidase genes in S. griseus were largely absent in the compost bacterial community and that they play a key role in the hydrolysis of non-dissolved nitrogen. This is the first study to identify the enzymes that enhance the hydrolysis of shrimp pond sludge and to show that the thermophilic bacterial community involved in composting has a low ability to secrete these enzymes.
Collapse
Affiliation(s)
- Syazni Zainul Kamal
- School of Environment and Society, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan; Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis, Kompleks Pengajian Jejawi 3, 02600, Arau, Perlis, Malaysia
| | - Mitsuhiko Koyama
- School of Environment and Society, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.
| | - Fadhil Syukri
- Faculty of Agriculture, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - Tatsuki Toda
- Faculty of Science and Engineering, Soka University, 1-236 Tangi-machi, Hachioji, Tokyo, 192-8577, Japan
| | - Quyen Ngoc Minh Tran
- School of Environment and Society, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Kiyohiko Nakasaki
- School of Environment and Society, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| |
Collapse
|
19
|
Li X, Xie H, Liu G, Zhang R, Ma X, Chen H. Optimizing temperature for enhancing waste activated sludge decomposition in lysozyme and rhamnolipid pretreatment system. BIORESOURCE TECHNOLOGY 2021; 341:125868. [PMID: 34523578 DOI: 10.1016/j.biortech.2021.125868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 08/27/2021] [Accepted: 08/28/2021] [Indexed: 06/13/2023]
Abstract
This study investigated the influence of temperature on the hydrolysis and decomposition of waste activated sludge (WAS) during the enhanced pretreatment system with lysozyme and rhamnolipid (Ly + RL). Results showed that temperature increasing from 15℃ to 55℃ could obviously enhance the release of soluble organic matters and WAS decomposition degree within the Ly + RL pretreatment system. Compared to the sum of sole Ly and sole RL pretreatment, Ly + RL combined pretreatment system at 45℃ presented best synergistic hydrolysis performance. The decomposition degree of bacteria and archaea reached 47.6% and 88.1%, respectively. Meanwhile, increasing temperature could recede the diversity of microbial community in the system. Gammaproteobacteria, with the relative abundance of 90.7%, occupied the absolute dominant position at 45℃. Furthermore, with the rise of temperature, more volatile fatty acids were harvested after anaerobic fermentation.
Collapse
Affiliation(s)
- Xiangkun Li
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Hongwei Xie
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Gaige Liu
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, PR China.
| | - Ruijun Zhang
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Xiaochen Ma
- School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Hongying Chen
- School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
| |
Collapse
|
20
|
Wang L, Zhao Y, Liu H, Song C, Wei Z, Chen X, Kang K, Yang H. The action difference of metabolic regulators on carbon conversion during different agricultural organic wastes composting. BIORESOURCE TECHNOLOGY 2021; 329:124902. [PMID: 33657500 DOI: 10.1016/j.biortech.2021.124902] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 02/19/2021] [Accepted: 02/20/2021] [Indexed: 06/12/2023]
Abstract
The purpose of this study is to explore the action characteristics of metabolic regulators like adenosine tri-phosphate (ATP) and malonic acid (MA) during rice straw (RS) and fruit and vegetable waste (FVW) composting. Results showed that due to the easy degradation difference, ATP and MA reduced CO2 emission in RS and FVW, respectively. Moreover, adding ATP and MA increased humic acids (HA) content in FVW more significantly (p < 0.05), especially for ATP. However, adding MA accelerated organic matter degradation during RS composting, which was basically consistent with CO2 emission, but it was not effective in promoting HA formation. Furthermore, the microbial community was reshaped by adding ATP and MA. Eventually, structural equation model further confirmed that adding metabolic regulators enhanced the biotic and abiotic pathways of HA formation, and the promotion effect of adding ATP was more obvious. The study has great practical significance for the dispose of agricultural waste.
Collapse
Affiliation(s)
- Liqin Wang
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Yue Zhao
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Hailong Liu
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Caihong Song
- College of Life Science, Northeast Agricultural University, Harbin 150030, China; College of Life Science, Liaocheng University, Liaocheng 252000, China
| | - Zimin Wei
- College of Life Science, Northeast Agricultural University, Harbin 150030, China.
| | - Xiaomeng Chen
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Kejia Kang
- Heilongjiang Province Environmental Science Research Institute, Harbin 150056, China
| | - Hongyan Yang
- Heilongjiang Province Environmental Science Research Institute, Harbin 150056, China
| |
Collapse
|
21
|
Jiang J, Zhou Z, Jiang L, Zheng Y, Zhao X, Chen G, Wang M, Huang J, An Y, Wu Z. Bacterial and Microfauna Mechanisms for Sludge Reduction in Carrier-Enhanced Anaerobic Side-Stream Reactors Revealed by Metagenomic Sequencing Analysis. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:6257-6269. [PMID: 33856183 DOI: 10.1021/acs.est.0c07880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Packing carriers into the anaerobic side-stream reactor (ASSR) can enhance sludge reduction and save footprint by investigating ASSR-coupled membrane bioreactors (AP-MBRs) under different hydraulic residence times of the ASSR (HRTSR). Three AP-MBRs and an anoxic-aerobic MBR (AO-MBR) showed efficient chemical oxygen demand (>94.2%) and ammonium nitrogen removal (>99.3%). AP-MBRs have higher (p < 0.05) total nitrogen (61.4-67.7%) and total phosphorus (57.5-63.8%) removal than AO-MBRs (47.8 and 47.7%). AP-MBRs achieved sludge reduction efficiencies of 11.8, 31.8, and 36.2% at HRTSR values of 2.5, 5.0, and 6.7 h. Packing carriers greatly improved sludge reduction under low HRTSR and is promising for accelerating sludge reduction in compact space. Metagenomic sequencing analysis showed that genes responsible for metabolism were enriched in AO-MBRs, while genes related to cellular motility and cell signaling were more abundant in the AP-MBRs. A longevity-regulating pathway showed that long lifespan provided more opportunities for worms to prey bacteria. Microscopic examination revealed that some specific protozoa (Arcella, Clathrulina, Aspidisca, Litonotus, Chiloclonella, and Vorticella) and metazoa (Rotaria and Aeolosoma hemprichi) were enriched in ASSRs. Aeolosoma hemprichi was only detected in ASSRs, and unique Cylops appeared on carriers. These results contribute to growing understanding of micrometabolic mechanisms including functional genes and microfauna-driving sludge reduction.
Collapse
Affiliation(s)
- Jie Jiang
- Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhen Zhou
- Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Lingyan Jiang
- Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Yue Zheng
- Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Xiaodan Zhao
- Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Guang Chen
- Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China
| | - Mengyu Wang
- Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Jing Huang
- Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Ying An
- Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhichao Wu
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| |
Collapse
|
22
|
Zhang Z, Ping Q, Gao D, Vanrolleghem PA, Li Y. Effects of ferric-phosphate forms on phosphorus release and the performance of anaerobic fermentation of waste activated sludge. BIORESOURCE TECHNOLOGY 2021; 323:124622. [PMID: 33421830 DOI: 10.1016/j.biortech.2020.124622] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/21/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
Five ferric-phosphate (Fe(III)Ps) with amorphous or crystalline structures were added to waste activated sludge (WAS) for anaerobic fermentation, aiming to investigate effects of Fe(III)Ps forms on phosphorus (P) release and the performance of WAS fermentation. The results revealed that the Fe(III) reduction rate of hexagonal-FePO4 was faster than that of monoclinic-FePO4·2H2O, thanks to its lower crystal field stabilization energy. FePO4·nH2O was reduced to vivianite and part of the phosphate was released as orthophosphate (PO4-P). Giniite (Fe5(PO4)4(OH)3·2H2O) as an iron hydroxyphosphate was transformed to βFe(III)Fe(II)(PO4)O-like compounds without PO4-P release. In addition, Fe(III)Ps had an adverse effect on the anaerobic fermentation of WAS. The specific hydrolysis rate constant and volatile fatty acids (VFAs) yield decreased by 38.4% and 41.9%, respectively, for the sludge sample with amorphous-FePO4·3H2O, which dropped the most. This study provides new insights into various forms of Fe(III)Ps performance during anaerobic fermentation and is beneficial to enhancing P recovery efficiency.
Collapse
Affiliation(s)
- Zhipeng Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Qian Ping
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Dan Gao
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Peter A Vanrolleghem
- Modeleau, Département de génie civil et de génie des eaux, Université Laval, 1065 av. de la Médecine, Québec, QC G1V 0A6, Canada
| | - Yongmei Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
| |
Collapse
|
23
|
Meng L, Wang J, Li X, Yu Y, Zhu Y. Microbial community and molecular ecological network in the EGSB reactor treating antibiotic wastewater: Response to environmental factors. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111669. [PMID: 33396179 DOI: 10.1016/j.ecoenv.2020.111669] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/04/2020] [Accepted: 11/13/2020] [Indexed: 06/12/2023]
Abstract
In this study, one lab-scale EGSB reactor (1.47 L volume) was designed to treat the antibiotic wastewater under different environmental factors, including the addition of cephalexin (CFX), Temperature (T) and Hydraulic Retention Time (HRT). The microbial community structure in EGSB reactor was analyzed with high-throughput sequencing technology to investigate their response to environmental factors changes, and then the random-matrix-theory (RMT)-based network analysis was used to investigate the microbial community's molecular ecological network in EGSB systems treating antibiotics wastewater. Moreover, the explanatory value of each environmental factor on the change of microbial community structure was obtained through the result of redundancy analysis (RDA). The results showed that the addition of cephalexin (CFX), decline of T and decline of HRT (8 h) would decrease the removal efficiency of COD decreasing. And the removal efficiency of CFX would not be affected by decline of T and HRT, except the producing and degrading process of CFX by-products was changed obviously. The result of RDA analysis suggested the environmental factors mainly affected bacterial and fungal microbial community structure but not archaeal ones. The result of high-throughput sequencing showed the relative abundance (RA) of Firmicutes had been obviously affected by T and HRT, which might be main reason leading to the decrease of COD removal efficiency. In addition, molecular ecological network analysis showed the growth of Bacteroidetes occupied the niche of functional microorganism and led to the unstable operation of EGSB when T declined. What's more, the molecular ecological network analysis revealed that Exophiala which belonged to fungi Ascomycota phylum was the hub genus to degrade complex refractory organic pollutants, and Aceticlastic methanogens Methanosaeta was the core functional archaea genus.
Collapse
Affiliation(s)
- Lingwei Meng
- School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin 132012, China.
| | - Jichao Wang
- School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin 132012, China
| | - Xiangkun Li
- School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China
| | - Yening Yu
- School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China.
| | - Yining Zhu
- Jilin Petro-chemical Company Power First Plant, Jilin 13202, China
| |
Collapse
|
24
|
Wang K, Zhou Z, Zheng Y, Jiang J, Huang J, Qiang J, An Y, Jiang L, Jiang LM, Wang Z. Understanding mechanisms of sludge in situ reduction in anaerobic side-stream reactor coupled membrane bioreactors packed with carriers at different filling fractions. BIORESOURCE TECHNOLOGY 2020; 316:123925. [PMID: 32758921 DOI: 10.1016/j.biortech.2020.123925] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 07/20/2020] [Accepted: 07/24/2020] [Indexed: 06/11/2023]
Abstract
An anoxic/oxic membrane bioreactor (AO) and three pilot-scale anaerobic side stream reactors (ASSR) coupled MBRs (ASSR-MBRs), packed with 0%, 25% and 50% carriers in ASSRs, were continuously operated to study the mechanisms for sludge reduction. Four systems showed efficient COD and NH4+-N removal, while packing carriers significantly enhanced nitrogen removal. 25% filling fraction (AP25) achieved the highest sludge reduction efficiency of 50.5% compared to 0% (21.7%) and 50% (39.7%). Compared to ASSR-MBR, carriers enhanced the release of dissolved organic matters, and accelerated the secretion of enzyme for cell lysis and hydrolysis. In AP25, the presence of carriers prompted the formation of environment propitious to sludge reduction in bulk sludge. AP25 tended to enrich hydrolytic, fermentative and denitrifying bacteria to accelerate hydrolysis process, while excessive carriers had negative effect on biomass stability and movement of carriers.
Collapse
Affiliation(s)
- Kaichong Wang
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhen Zhou
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
| | - Yue Zheng
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Jie Jiang
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Jing Huang
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Jiaxin Qiang
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Ying An
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Lingyan Jiang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China
| | - Lu-Man Jiang
- Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhiwei Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| |
Collapse
|
25
|
Chen Z, Li W, Qin W, Sun C, Wang J, Wen X. Long-term performance and microbial community characteristics of pilot-scale anaerobic reactors for thermal hydrolyzed sludge digestion under mesophilic and thermophilic conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 720:137566. [PMID: 32146395 DOI: 10.1016/j.scitotenv.2020.137566] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 02/22/2020] [Accepted: 02/24/2020] [Indexed: 06/10/2023]
Abstract
Anaerobic digestion (AD) with thermal hydrolysis pretreatment has been attracted widespread attention in recent years due to its high efficiency. However, few studies focus on systematical comparison of the downstream AD processes for thermal hydrolyzed sludge and their corresponding microbial community compositions, especially on those at pilot scale and above. Thus, this study systematically compared the long-term performance and microbial communities of two pilot-scale anaerobic reactors for thermal hydrolyzed sludge digestion under mesophilic and thermophilic conditions. The results presented that mesophilic anaerobic digestion (MAD) showed a better performance of methane production than thermophilic anaerobic digestion (TAD). The hydraulic retention time (HRT) needed to be longer than 12 days in MAD while 20 days in TAD to achieve the relatively high methane production, which could be explained by that the ammonia nitrogen accumulation especially the free ammonia determined in TAD was higher than that in MAD at all HRTs, emerging an inhibition of methane yield in TAD. High-throughput Illumina sequencing results demonstrated a more diverse microbial community in MAD than that in TAD. TAD was mediated by a suite of thermophiles, such as Coprothermobacter and Methanothermobacter, while taxa harbored in MAD mostly belonged to Bacteroidetes and relatively broad types of methanogens. In addition, hydrogenotrophic methanogens were the predominant of archaea communities in both digesters probably due to the relatively high concentration of ammonia nitrogen.
Collapse
Affiliation(s)
- Zhan Chen
- School of Environment, Tsinghua University, Beijing 10084, China
| | - Wei Li
- Research and Development Center, Beijing Drainage Group Co. Ltd., Beijing 100124, China
| | - Wentao Qin
- School of Environment, Tsinghua University, Beijing 10084, China; Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing Engineering Research Center for Edible Mushroom, Beijing 100097, China
| | - Chenxiang Sun
- School of Environment, Tsinghua University, Beijing 10084, China
| | - Jiawei Wang
- Research and Development Center, Beijing Drainage Group Co. Ltd., Beijing 100124, China
| | - Xianghua Wen
- School of Environment, Tsinghua University, Beijing 10084, China.
| |
Collapse
|
26
|
Zhang G, Shi Y, Zhao Z, Wang X, Dou M. Enhanced two-phase anaerobic digestion of waste-activated sludge by combining magnetite and zero-valent iron. BIORESOURCE TECHNOLOGY 2020; 306:123122. [PMID: 32197189 DOI: 10.1016/j.biortech.2020.123122] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 02/27/2020] [Accepted: 02/29/2020] [Indexed: 06/10/2023]
Abstract
Previous studies have found that magnetite can promote the hydrolysis-acidification but inhibit the methanogenesis, while zero-valent iron (ZVI) only promoted the methanogenesis. Therefore, a new two-phase anaerobic digestion model, in which magnetite was added to the first phase, and ZVI was added to the second phase, was proposed to promote both hydrolysis-acidification and methanogenesis and avoid magnetite inhibition. The results showed that in the new model, methane production was improved by 10.2% and 18.1% and chemical oxygen demand (COD) removal was improved by 7.9% and 10.9% compared with reactors that included only magnetite and only ZVI, respectively. In the new model reactors, inhibition of methanogenesis by magnetite was avoided compared with that of the magnetite-only reactors, and hydrolysis efficiency was improved via dissimilatory iron reduction (DIR) compared with that of ZVI-only reactors. The data on volatile fatty acids (VFAs), coenzyme F420 and electron transfer system (ETS) further confirmed these conclusions.
Collapse
Affiliation(s)
- Guangyi Zhang
- School of Ecology and Environment, Zhengzhou University, Kexue Road 100, Zhengzhou 450001, China; School of Water Conservancy Science and Engineering, Zhengzhou University, Kexue Road 100, Zhengzhou 450001, China
| | - Yinghao Shi
- School of Water Conservancy Science and Engineering, Zhengzhou University, Kexue Road 100, Zhengzhou 450001, China
| | - Zisheng Zhao
- School of Ecology and Environment, Zhengzhou University, Kexue Road 100, Zhengzhou 450001, China.
| | - Xiaowei Wang
- School of Ecology and Environment, Zhengzhou University, Kexue Road 100, Zhengzhou 450001, China
| | - Ming Dou
- School of Ecology and Environment, Zhengzhou University, Kexue Road 100, Zhengzhou 450001, China
| |
Collapse
|
27
|
Wu J, Zhao Y, Wang F, Zhao X, Dang Q, Tong T, Wei Z. Identifying the action ways of function materials in catalyzing organic waste transformation into humus during chicken manure composting. BIORESOURCE TECHNOLOGY 2020; 303:122927. [PMID: 32050125 DOI: 10.1016/j.biortech.2020.122927] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/21/2020] [Accepted: 01/27/2020] [Indexed: 06/10/2023]
Abstract
The aim of this study is to detect the action properties of functional materials (FM) in transforming waste into resource products with high humus content. FM (MnO2 and reducing sugar) were added in different periods of chicken manure composting. During composting, concentration of humic acids (HA) as aromatic fraction of humus, was increased by FM. The promotive effects of adding FM in later period was the most obvious. While adding FM in the beginning period could accelerate organic matter degradation, but it did not promote HA formation. Meanwhile, the microbial diversity was higher in groups by adding FM in the beginning and thermophilic periods. Therefore, it was speculated that FM might improve HA formation by promoting the abiotic polymerization of precursors. Eventually, structural equation model showed that FM was beneficial to abiotic pathway of HA formation. But the formation efficiency was reduced by interfering with biotic pathway.
Collapse
Affiliation(s)
- Junqiu Wu
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Yue Zhao
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Feng Wang
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Xinyu Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, China
| | - Qiuling Dang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, China
| | - Tianjiao Tong
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Zimin Wei
- College of Life Science, Northeast Agricultural University, Harbin 150030, China.
| |
Collapse
|
28
|
Shi M, Zhao X, Zhu L, Wu J, Mohamed TA, Zhang X, Chen X, Zhao Y, Wei Z. Elucidating the negative effect of denitrification on aromatic humic substance formation during sludge aerobic fermentation. JOURNAL OF HAZARDOUS MATERIALS 2020; 388:122086. [PMID: 31972435 DOI: 10.1016/j.jhazmat.2020.122086] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 01/09/2020] [Accepted: 01/13/2020] [Indexed: 06/10/2023]
Abstract
Humic substance (HS), as an aromatic compound, is the core product of aerobic fermentation. Denitrification-dependent degradation of aromatic compounds have been repeatedly observed in environment. However, few studies have elucidated the relationship between denitrification and aromatic HS during sludge aerobic fermentation. This study was conducted to investigate the effect of enhanced denitrification on aromatic HS formation. On the 24th day of sludge aerobic fermentation, five tests (CK, Run1, Run2, Run3 and Run4) were executed, and nitrate concentrations were adjusted to 480 ± 20, 500 ± 20, 1000 ± 20, 1500 ± 20 and 2000 ± 20 mg/kg with potassium nitrate, respectively. Analytical results demonstrated that nitrate addition increased denitrifying genes abundance and enhanced denitrification, which further reduced aromatic HS formation (p < 0.05). Especially in Run3, the concentrations of HS and humic acid on the 52nd day dramatically decreased by 12.9 % and 34.2 % in comparison with those on the 31st day. High-throughput sequencing revealed that enhanced denitrification effectively stimulated the metabolism of denitrifying microorganisms with aromatic-degrading capability. Co-occurring network analysis indicated that some keystone taxa of denitrification aromatic-degrading microorganisms involved in the conversion of nitrate to nitrite were the most crucial for enhancing denitrification and reducing aromatic HS formation.
Collapse
Affiliation(s)
- Mingzi Shi
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Xinyu Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Longji Zhu
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Junqiu Wu
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Taha Ahmed Mohamed
- College of Life Science, Northeast Agricultural University, Harbin 150030, China; Soil, Water and Environment Research Institute, Agricultural Research Center, Giza, Egypt
| | - Xu Zhang
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Xiaomeng Chen
- College of Life Science, Northeast Agricultural University, Harbin 150030, China
| | - Yue Zhao
- College of Life Science, Northeast Agricultural University, Harbin 150030, China.
| | - Zimin Wei
- College of Life Science, Northeast Agricultural University, Harbin 150030, China.
| |
Collapse
|
29
|
Jafari S, Salehiziri M, Foroozesh E, Bardi MJ, Rad HA. An evaluation of lysozyme enzyme and thermal pretreatments on dairy sludge digestion and gas production. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 81:1052-1062. [PMID: 32541121 DOI: 10.2166/wst.2020.198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Anaerobic digestion is one of the common methods of managing and stabilizing sludge. However, due to the limitations of the biological sludge hydrolysis stage, anaerobic decomposition is slow and requires a long time. This study evaluated the effects of thermal (80 °C) (TH-PRE) and a combination of thermal with the lysozyme enzyme (LTH-PRE) pretreatments on the enhancement of anaerobic activated sludge digestion. Response surface methodology was implemented to optimize enzyme pretreatment conditions (enzyme and mixed liquid suspended solids concentration). The results showed that both pretreatment methods increase soluble chemical oxygen demand (COD) and reduces total and volatile suspended solids (VSS), and phosphate concentration. The COD removal rate in LTH-PRE and TH-PRE was 95% and 81%, respectively. The value of VSS reduction in LTH-PRE and TH-PRE was 41% and 31%, more than the control operation, respectively. The biogas production in LTH-PRE and in TH-PRE also increased by 124% and 96%, respectively.
Collapse
Affiliation(s)
- Shakiba Jafari
- Babol Noshirvani University of Technology, Bobol, Iran E-mail:
| | | | - Elham Foroozesh
- Babol Noshirvani University of Technology, Bobol, Iran E-mail:
| | | | - Hasan A Rad
- Babol Noshirvani University of Technology, Bobol, Iran E-mail:
| |
Collapse
|
30
|
Liu G, Li X, Ma X, Ma L, Chen H. Hydrolysis and decomposition of waste activated sludge with combined lysozyme and rhamnolipid treatment: Effect of pH. BIORESOURCE TECHNOLOGY 2019; 293:122074. [PMID: 31491652 DOI: 10.1016/j.biortech.2019.122074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 08/22/2019] [Accepted: 08/24/2019] [Indexed: 06/10/2023]
Abstract
Effect of pH on waste activated sludge (WAS) hydrolysis and decomposition treating with lysozyme and rhamnolipid combined (Ly + RL) was investigated in this study. Results showed that Ly + RL system could significantly improve the release of soluble organic matters at the optimal RL dosage of 0.3 g/gSS and lysozyme dosage of 0.15 g/gSS. Alkali conditions showed better effect than that of acid on the release of soluble organics, improvement of WAS biodegradability and reduction of big floc size within Ly + RL treatment system and the optimal pH was 10. And 9591.6 mg/L soluble chemical oxygen demand (SCOD), 1612.0 mg/L protein and 1211.6 mg/L polysaccharide were released at pH10 after 12 h co-digestion. 83.7% bacteria and 92.2% archaea were decomposed at pH10. Class Gammaproteobacteria (82.4%) was the predominant bacteria after treated by Ly + RL system, and the treated WAS was beneficial for the subsequent organics bio-degradation and volatile fatty acids accumulation.
Collapse
Affiliation(s)
- Gaige Liu
- School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China; School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Xiangkun Li
- School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China.
| | - Xiaochen Ma
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Linli Ma
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Hongying Chen
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| |
Collapse
|
31
|
Liu G, Li X, Ma L, Ma X, Chen H. Enhancement of excess sludge hydrolysis and decomposition by combined lysozyme and rhamnolipid pretreatment. BIORESOURCE TECHNOLOGY 2019; 289:121703. [PMID: 31271912 DOI: 10.1016/j.biortech.2019.121703] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 06/22/2019] [Accepted: 06/25/2019] [Indexed: 06/09/2023]
Abstract
Feasibility of combined lysozyme and rhamolipid (RL) pretreatment on the enhancement of excess sludge (ES) hydrolysis and decomposition was assessed in this study. Results showed lysozyme and RL combined treatment could significantly promote ES hydrolysis and decomposition, an additional 1196.9 mg/L soluble chemical oxygen demand (SCOD), 792.5 mg/L protein and 133.5 mg/L polysaccharide were released compared with the sum of sole RL and sole lysozyme treatment at the optimal RL dosage of 0.3 g/gSS and lysozyme dosage of 0.15 g/gSS after 8 h co-digestion. 45.3% bacteria and 84.5% archaea decomposition degree were gained under the combined treatment at the optimal RL dosage. Class Gammaproteobacteria and genus Methanothrix were the predominant bacteria and archaea with the relative abundance of 72.4% and 60.8%, respectively. After the combined pretreatment, ES was beneficial for volatile fatty acids accumulation and acetic acid dependent methane generating inferred from the results of microbial community composition.
Collapse
Affiliation(s)
- Gaige Liu
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Xiangkun Li
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China.
| | - Linli Ma
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Xiaochen Ma
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Hongying Chen
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| |
Collapse
|
32
|
Evaluation of Feasibility of Using the Bacteriophage T4 Lysozyme to Improve the Hydrolysis and Biochemical Methane Potential of Secondary Sludge. ENERGIES 2019. [DOI: 10.3390/en12193644] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Anaerobic digestion (AD) of secondary sludge is a rate-limiting step due to the bacterial cell wall. In this study, experiments were performed to characterize secondary sludges from three wastewater treatment plants (WWTPs), and to investigate the feasibility of using bacteriophage lysozymes to speed up AD by accelerating the degradation of bacterial cell walls. Protein was the main organic material (67.7% of volatile solids in the sludge). The bacteriophage T4 lysozyme (T4L) was tested for hydrolysis and biochemical methane potential. Variations in the volatile suspended solid (VSS) concentration and biogas production were monitored. The VSS reduction efficiencies by hydrolysis using T4L for 72 h increased and ranged from 17.8% to 26.4%. Biogas production using T4L treated sludges increased and biogas production was increased by as much as 82.4%. Biogas production rate also increased, and the average reaction rate coefficient of first-order kinetics was 0.56 ± 0.02/d, which was up to 47.5% higher compared to the untreated samples at the maximum. Alphaproteobacteria, Betaproteobacteria, Flavobacteriia, Gammaproteobacteria, and Sphingobacteriia were major microbial classes in all sludges. The interpretation of the microbial community structure indicated that T4L treatment is likely to increase the rate of cell wall digestion.
Collapse
|